Authors:

Whatever hath been written shall remain, Nor be erased nor written o'er again; The unwritten only still belongs to thee: Take heed, and ponder well what that shall be.

Henry Wadsworth Longfellow (2013). “Delphi Complete Works of Henry Wadsworth Longfellow (Illustrated)”, p.917, Delphi Classics
Whatever hath been written shall remain, Nor be erased nor written o'er again; The unwritten only still belongs to thee: Take heed, and ponder well what that shall be.